/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2021-2021. All rights reserved.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.bonc.sdk.core.region;

import java.util.LinkedHashMap;
import java.util.Map;

public class EnvRegionCache {
    private static volatile EnvRegionCache instance;

    protected final Map<String, Region> value;

    private EnvRegionCache(Map<String, Region> value) {
        this.value = value;
    }

    protected static EnvRegionCache getInstance() {
        if (instance != null) {
            return instance;
        }
        synchronized (EnvRegionCache.class) {
            if (instance == null) {
                instance = new EnvRegionCache(new LinkedHashMap<>());
            }
            return instance;
        }
    }
}
